This paper, for the first time, brings up a new conception of fuzzy language field and a new method of fuzzy integrated algorithm (FIA) in the background of the product device hazard level rating and they are put to verify effectively in the applications of many chemical industry instances. It opens up a path for the integration of fuzzy system method, fuzzy analysis and design, and computer-assisted safe evaluation (CASE) in the general discrete-state space. (C) 1998 Elsevier Science B.V. [References: 6]
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